Bernie Sanders; Dianne Feinstein; Hillary Clinton (Credit: Getty/Maddie McGarvey/AP/Jeff Chiu/Matt Rourke) Sen. Dianne Feinstein of California has just announced that she plans to run for re-election to the Senate next year, hoping to hold onto a seat she has held since 1992. In reporting her decision on Monday, the Associated Press included the Feinstein is the “oldest senator at 84” in its headline and noted that she “is at an age when many Americans are deep into their retirement years” in its first sentence.